Blockchain groups unite around a threat that remains theoretical: quantum computers could eventually expose parts of Bitcoin’s security. The Quantum Alliance, launched Oct. 15 in Lisbon, brings together nine organizations to develop shared standards for protecting cryptocurrency networks, wallets and infrastructure.
The coalition’s contributors estimate that roughly 6.4 million $BTC have exposed public keys that sufficiently powerful quantum machines could exploit. But no quantum computer can carry out such an attack today, and estimates of when that might change vary.
Blockchain Groups Unite to Set Shared Standards
The Quantum Alliance includes Quantus, American Fortress, Intmax, Keystone, Midnight Foundation, Postquant Labs, Abelian, The Vault and Hacken. The contributors plan to publish standards for evaluating whether existing networks are prepared for quantum attacks. They are not setting out to create another blockchain.
The work spans four areas: moving existing funds to safer cryptography, evaluating privacy technology, protecting wallets and making security tools work across blockchains. The group is modeled on the Internet Engineering Task Force, where technical proposals are developed openly rather than dictated by one company.
The initiative joins other blockchain projects examining post-quantum defenses. BlockTelegraph previously reported on a post-quantum blockchain testnet, a separate effort that tested quantum-resistant transactions.
Why Exposed Bitcoin Keys Could Matter Later
Bitcoin wallets use digital signatures to show that someone may spend coins. When some wallets make transactions, they reveal public keys that stay visible on the blockchain. Current computers cannot realistically use those keys to discover the corresponding private keys.
A sufficiently advanced quantum computer running Shor’s algorithm could potentially break that protection. The Alliance estimates that approximately 6.04 million to 6.4 million $BTC are exposed, about 30% of Bitcoin’s total supply. An estimated 1.1 million $BTC associated with Satoshi Nakamoto’s early holdings fall within the broader group of potentially vulnerable coins.
Those estimates describe a possible future risk, not a present ability to take funds. The threat depends on quantum computers becoming powerful and reliable enough to break the cryptography. The source also notes that blockchain finance is developing across institutions, including in banking and payment networks, where security standards remain a relevant industry concern.
Quantum Timelines Remain Estimates
Google Quantum AI recently demonstrated “magic state cultivation” on its Willow quantum processor. The technique reduced errors by a factor of 40, while researchers achieved 99.99% accuracy in specialized quantum states needed for powerful, reliable quantum computers. The results mark progress in quantum research, but they do not demonstrate a machine capable of attacking Bitcoin.
Postquant Labs co-founders Dr. Richard T. Carback III and Colton Dillion created the Quantum Doom Clock to estimate when quantum computers might threaten cryptography used by Bitcoin, Ethereum, other cryptocurrencies and traditional finance. Alliance contributors have another version that points to March 2028 as an early possible window.
That clock’s model considers roughly 856,000 physical qubits necessary to break current cryptocurrency security. It tracks past growth and the most powerful machines to estimate when that level might be reached. The date is not a prediction of an inevitable attack; other researchers place the danger more likely in the 2030s.
Moving Existing Funds Is a Difficult Challenge
Even if Bitcoin adopts stronger cryptography, coins in forgotten wallets, lost accounts or addresses whose owners do not upgrade could remain exposed. No one can simply order every Bitcoin holder to move funds. Stablecoin systems, blockchain bridges and other cryptocurrency infrastructure also depend on cryptographic protections that future quantum computers might defeat.
The Alliance says it aims to publish common tests and migration guidelines, leaving individual networks to decide how to respond. Other blockchain applications, including tokenized equities, illustrate the range of systems using blockchain platforms. The next concrete step described by the coalition is developing those standards and guidelines while the quantum threat remains theoretical.